Question

Given the folloiwng two half-reactions: Fe3+ (aq) + 3 e− --> Fe (s)             E0 =...

Given the folloiwng two half-reactions:

Fe3+ (aq) + 3 e− --> Fe (s)             E0 = −0.036 V

Mg2+(aq) + 2 e− --> Mg (s) E0 = −2.37 V

Calculate cell potential (Ecell) for a voltaic cell when [Fe3+] = 1.0 *10-3 M, [Mg2+] = 2.50 M at 25 oC

Hint: (1) Write the overall redox reaction and count the number of electrons transferred; (2) determine the cell potential for a voltaic cell; (3) Calculate Q; (4) Plug in the values into Nernst equation.

-2.26 V
2.26 V
2.33 V
-2.33 V
2.40 V
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